Process for producing cellulose formations.



, concentrate v RUDOLF LINKMEYER, 0F BREMEN, GERMANY.

) PROCESS FOR PRODUCING CELLULOSE-FORMATIONS.

1,062,106. No Drawing.

Specification of Letters Patent.

Patented May 20, 1913.

Application filed May 28, 1909. Serial No. 499,000.

To all whom, it may concern:

Be it known that I, RUDoLF LINKMEYER,

.a subject of the German Emperor, and resident of Bremen, Germany, have invented a new and useful Improved Process for Producing Cellulose Formations, of which the following is a specification.

. The subject matter of my invention is a improved process for producing formations of cellulose, as for instance, threads, ribbons and the like.

Formations ofcellulose from ammoniacal copper oxid solutions cupro-ammonium so lutlons of cellulose, have hitherto been 10btamed by .precipitating with acids, or in a bath ,consisting either of caustic alkalis alone, or of chlorids of alkalis mixed with the caustic alkalis.

I have discovered that the chlorids of the magnesium group, such as magnesium chlor 1d and, further, the chlorids of the alum n1umgroup, such as aluminium chlorid, can be effectively employed as agents for precipitating the cellulose from the ammoniacal copper oxid solutions. &

Artlficialthreads thus produced show a high-degree of elasticity and areperfectly transparent. The formations obtained show Immediately after their recipitation a strength of such degree as as not been observed in cases where caustic alkalis had been employed. i It ls-a dvantageous to slightly acidulate the bath and to make provision that a slightly acid reaction is maintained by add ing small quantities of acid from time to t me. Hydrochloric acid has proved very useful for this purpose. It is also advantageous to add to the bath organic substances such as alcohol (monoatomic or polyatomic) and carbohydrates, such as sugar, and others.

Ew'amplet An ammoniacal copper oxid solution contalning 60 grams 0 cellulose per liter 1s used. The dprecipitatin bath consists of a, solution 0 magnesium ChlOIld or aluminium chlorid. It may either be used cold or warm; Suflicient hydrochloric slightly acid reaction. Thereafter a small quantity of alcohol is poured into the bath amounting to about one-half per cent. in weight of the entire bath. The desired object is then formed by forcing the solutiofr of celluloseth'rough an opening of suitable acid is added to the bath to produce-a shape and bringing the shaped object into contact with the bath as described. .The.

coagulation takesplace instantaneously,

' and it is therefore possible to produce the objects'at very great speed.

. The cellulose solutions used may also contain other organic substances such as alcohols, carbohydrates, such as gums, etc.

I claim- 1; The process for the production'of cellulose formations, which comprises shaping a cupro-ammonium-cellulose solution, and coagulating the shape formed by an acidulated solution containing a chlorld of .the magnesium group substantially as described. r

2. The process for the production of cellulose formations which comprises shaping a cu'pro-ammonium cellulose solution and coagulating the shape so formed by an acidulated solution containing a chlorid of the magnesium group and an organic substance.

3.'The process for the production of cellulose formations, which comprises shaping a cupro-ammonium cellulose solution and coagulating the shape so formed bya solution containing a chlorid of the magnesium group and an organic substance.-

4. The process for'the production of cellulose formations, which comprises shaping a cu'pro-ammonium cellulose solution and v coagulating the shape by an acidified solu-' tion of magnesium chlorid containing a small quantity of alcohol.

In testimony whereof, I afiix my signa ture in the presence of two witnesses.

RUDOLF LINKMEYER.

' Witnesses:

.FERDINAiND- REIoH, PAUL MrNoK. 

